PowerPoint Präsentation des FZ Rossendorf

PowerPoint Präsentation des FZ Rossendorf

New possibilities for velocity measurements in metallic melts S. Eckert, G. Gerbeth, F. Stefani Department Magnetohydrodynamics, Forschungszentrum Rossendorf P.O. Box 510119, D-01314 Dresden, Germany, http://www.fz-rossendorf.de/FWS/FWSH E-mail: [email protected] Sino-German Workshop on Electromagnetic Processing of Materials Oct. 11-13, Shanghai, China Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 1 Why do we need flow measurements in metallic melts ? Knowledge about the flow field and the transport

properties of the flow Optimisation of products, technologies and facilities better understanding of the process validation of CFD models on-line control and monitoring Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 2 Current situation Commercial measuring techniques for liquid metal flows are almost not available ! Reasons

properties of the fluid (opaqueness, heat conductivity,..) high temperatures chemical reactivity interfacial effects external electromagnetic fields Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 3 Goals to develop measuring techniques for liquid metal flows at moderate temperatures model experiments (T 300C)C) to extend the range of application towards higher temperatures

Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 4 Data of interest flow rate local velocity fluctuations, turbulence level flow pattern (velocity profiles, 3D-structure) Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 5 List of measuring techniques Local probes (invasive)

Electric Potential Probe (EPP, Vives Probe) Mechano-Optical Probe (MOP) Ultrasonic methods (non-invasive, but need contact) Ultrasound Doppler Velocimetry (UDV) Inductive methods (contact-less) Inductive Flowmeter (IFM) Contactless Inductive Flow Tomography (CIFT) X-ray radioscopy Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China

6 Ultrasound Doppler Velocimetry (UDV) Takeda (1987, 1991) Commercial instrument standard transducers (Tmax = 150C)C) Measurement of instantaneous velocity profiles Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 7 UDV in liquid metals problems High temperature Acoustic coupling

Transmission of ultrasonic energy through interfaces (channel walls) Wetting conditions Availability of reflecting particles Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 9 Concept of an integrated probe I Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 10 Concept of an integrated probe II

Collaboration with the University Nishni-Novgorod (Russia) Piezoelectric transducer coupled on an acoustic wave guide made of stainless steel Stainless steel foil (0.1 mm) wrapped axially around a capillary tube: length 200 mm, outer diameter 7.5 mm Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 11 UDV Flows driven by RMF/TMF Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 14 UDV Flow driven by RMF Vertical velocity

Streamfunction Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 15 UDV Flow driven by TMF Vertical velocity Streamfunction Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 16 UDV Flow driven by RMF/TMF Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China

17 UDV in CuSn/Al Experimental Set-up Rectangular alumina crucible (130 80 mm2) melt depth 40 mm inductive heater

melt temperature: 620C)C (CuSn), 750C)C (Al) installation of the integrated sensor at the free surface of the melt Doppler angle 35C) Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 18 UDV in CuSn/Al Results 60 40

100 velocity [mm/s] velocity [mm/s] 200 0 -100 -200 70 position 1 position 2 75

80 85 90 95 100 measuring depth [mm] Profiles obtained at two positions: different signs similarity of shape and amplitude 20 0 -20

-40 -60 10.0 12.5 15.0 17.5 20.0 22.5 25.0 time [s] Velocity signal obtained in liquid aluminium by up-and-down moving

of the sensor by hand Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 19 Contactless Inductive Flow Tomography (CIFT) An existing flow field will modify an applied magnetic field: B=B0+b, b~Rm B0 (Rm=Lv) e.g. the magnetic field measured outside the melt contains information about the flow field Rm ~ 10-3 b ~ O(T)

Example: crystal growth configuration (Czochralski method) Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 20 CIFT - Basics Bio-Savarts law rot u ( r ' ) B( r ' ) 0 B(r ) 0 dV

4 V r r' 4 r s' ( s ' ) dS ' 3 r s' S 1 div u ( r ' ) B( r ' ) 1 ( s )

dV 2 V s r' 2 s s' ( s ' ) dS ' 3 s s' S

inverse method to reconstruct the velocity field additional requirements: mass conservation (div u = 0) Tichonov regularization (keeps the mean quadratic curvature of the velocity field finite) Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 21 CIFT - Experiment

Cylinder filled with InGaSn (D = 180 mm , H = 180 mm) Magnetic field: two pairs of Helmholtz coils 10mT 48 Hall sensors (KSY44-Infineon, resolution 1 T) Mechanical stirrer (2000rpm) max. velocity ~ 1 m/s Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 22 CIFT - Experiment

Lid with stirrer and motor Vessel, electronic equipment Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 23 CIFT - Results Induced magnetic field for transverse primary field Induced magnetic field for axial primary field Reconstructed velocity field Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China

24 CIFT - Results Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China 25 Conclusions Several measuring techniques exist to determine the velocity field in metallic melts Successful investigations are under progress to extend the application range towards higher temperatures Promising new developments: Ultrasound Doppler Velocimetry (UDV) Contactless Inductive Flow Tomography (CIFT) Sino-German-Workshop, Oct. 11-13 2004, Shanghai, China

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